Helictosperma malacophylla. A, flowering branch B fruiting branch C flower D bract, bracteole, ovary and calyx E longitudinal section through ovary and calyx F longitudinally opened corolla showing the position of stamens and style G stamens H placenta and ovules, abaxial view I placenta and ovules, adaxial view J fruit. A–C, E–G, J reproduced or adapted from Drake del Castillo (1897: Pl. 422) D De Block et al. 534 H, I De Block et al. 797.

  Part of: De Block P, Rakotonasolo F, Ntore S, Razafimandimbison SG, Janssens S (2018) Four new endemic genera of Rubiaceae (Pavetteae) from Madagascar represent multiple radiations into drylands. PhytoKeys 99: 1-66. https://doi.org/10.3897/phytokeys.99.23713